Method of making hollow forms



Nov. 4, 1941.

J. R. HEMPHILL METHOD OF MAKING HOLLOW FORMS Filed June 27, 1941 INVENTOR JhMEs R. HEMPH/LL ATTORNEYS Patented Nov. 4, 1941 2,261,583 METHOD or MAKING noLLow Forms James It. Hemphill, Akron,'0hio, assignor to The v Colonial Insulator Company, Akron, Ohio, it

corporation oi Ohio Application June 27, 1941, se i l No..4i00,063

3 Claims. (ones-156),

The present invention relates to the manufacture of hollow forms which are usually employed in the making of rubber gloves, or other goods of a like nature. These forms are commonly made of porcelain or other ceramic, material'and are coated with a glaze, the rubber being deposited thereon and subsequently cured. In large forms of this ype, .and particularly those used in the manufacture of gloves, the form-consists of a hollow bodyportion across the bottom of which is located a base to which the customary fastening elements are secured. v

V In former methods of manufacturing forms of this character, the main or body portion is 'de posited in the cavity of a mold and across the top of the form is placed a slab of porcelain,- the twoparts being united-by the usu'al.slir.-., The' forms are then fired and the union between thebase and the body of the form is completed. It

has been found, however, that forms madein this w ing around the top or mouth of the mold an overhanging or cap member so that an angular recess-is provided around the mold at that-portion whichlwill; form the lower edge of the form. this manner'fthe edge, of the form, which is uppermost. inthe' casting operation, wlllbe providedjwith an overhanging-flange. Thisoverhangin'g'portion is trimmed along the topoi the ,mold, leavin'g'a tapered ilange about the interior wall of the hollow: form. 'When the porcelain casting is sufllciently dry to permit handling, it is vremoved from the mold, ,the form reversed and pressed firmly against a slab oi porcelain whichformsthe' base; The lower edge of the body is dipped in the slip so as to perfect the union. The base then trimmed and the form glazed .and

baked.

all

manner fracture readily at the seam between the base and the body .of the form.

In order to correct this fault in the old type of form and to construct a form. in which the separation at the base of the form is eliminated,

the process 0! manufacturing. the iorms shown and described herein has been created. By the, process which is here'disclosed, a form is created in which the base of the form is connected to the body in such a manner that breakage or cleavage.

of the formalong the seam is eliminated. Forms madeby the process herein described will break at otherpoints rather than at the Junction -between the base and the body of the form.

While the description and drawing de tailed in order to disclose the preferred method,

it will be understood that exact'coniormity with the details of the process is not essential and modifications and changes'may be made within the scope. of the invention as set forth in the appended claims.

In the drawing in whicli'tlie best knownimethod oi practising the invention is disclosed:

Fig. 1 is a-secti 'nal view 01 a mold in which the body or the orm is cast, this being'shown,

by wayoi example, for the making oi a. v rubber" glove form;

Fig. 2 is a fragmentary viewiof the second step in the process;

Fig. 3 is a view showing the manner of applying the base to the form; and

Fig. 4 is a view showing a portion'oi: the completed form after firing. I I v Briefly stated, the process consists in casting the body of the form in the usual mold, but provid- Themethod described will provide a substan- I tial, fillet across the'angle between the wall of the form body and the base and the excess slip will tend to form a bead atvthe junction of the fillet Referring to the drawing in detail, the mold, which is usuallyin two parts, is indicated by the numeral [0 and is made'from plaster of Paris or similar porous material. The. cavity is indicated at H and 'isshown in the-shape oia glove. Over the .top of the mold-is placed'a; forming ring, indicated at 12, which likewise made of porous materiaL but overhangs the cavity of the form. as shown at H, The extent of the overhang may be varied as desired, but is suflicient to provide for the formation; of a substantial inwardly projecting; flange aboutjthe opening 'in the body portion.

when the-mold and the superposed cap are assembleithe cavity is jfllled; with the slip-of the desired composition and permitted to stand until a suflici'ent body" of the porcelain has been deposited on the'walls. oiithef porous mold and ring; -As the cap or ring'isalso porous, a reduced 'collar 15 will be. deposited :at the mouth of the form l5. The cap the inner-wall of which is tapered so asto permit; its withdrawal, is then "liftediirom the mold and the upwardly project- '-ing'collar lfiiscut-oiralong the line II which is preferably-in line with'the topoi the mold. This leave thejoverhanging tapered flange l8 aboutthemouth oi the form, which latter ,form's theftlllet. a w

I .When the casting sufilciently dry, the-mold isrenioved and-the partially finished form is reversed andjpressedflrmly against a slab 20 ct similar porcelain to'iorm the base. The bottom oi'the iorm'is dippedin' slip before it is applied 'tothebasaandwhe'nthebodyispressedagaiiist the base, the excess slip will be forced out around the innerline of the seam to form a bead ill The base is then trimmed ofl' alongthe line ii, which also removes any bead which would form on the outside oi the The form is now dried and baked and, when completed,"will b a' single. integral structure Provided with the flllet at the base. This new structure will have great strength and will resist any tendency to fracture at the seam. While it is preferred to form the flllet as a continuous ring, it might be desirable to form the flllet in segments only, and other modifications might be suggested to those skilled in the art.

What is claimed is:

1. The method of making a hollow form of ceramic material consisting of a base and a body portion, the steps of casting the body portion in the cavity or a porous mold provided with a removable cap, the cap overhanging the mouth of the cavity so that a deposit of the ceramic material is made in the angle between the mold and the cap and a collar is formed on the interior of the cap, removing the cap, trimming the body portion at the base of the collar, applying a base of ceramic material to the edge of the body portion, and baking the completed form.

2. The method of making a hollow ceramic article consisting of a hollow body portion and a base enclosing the body portion, said method consisting in casting the body portion in the cavity 01' a porous mold provided with a removable portlon overhanging the mold cavity so that the ceramic material deposits on the walls and; in the angle at the overhanging portion, trimming the edge of the casting thus formed adjacent the said angle to leave a flange about. the interior of the casting, uniting a base of the ceramic material to the edge of the body portion and the flange, and baking the completed structure.

3. The'method oi making a hollow ceramic article consisting of a hollow body portion and a base enclosing the body portion, said method consisting in casting the body portion in the cavity of a porous mold provided with a remo vable portion overhanging the mold cavity so that the ceramic material deposits on the walls and in the angle at the overhanging portion, trim- I ming the edge of the casting thus formed adjacent the said angle to leave a flange about the interior of the casting, applying slip to the edge 01' the body portion, uniting a base of the ceramic materialto the edge of the body portion and the flange, and baking the completed structure.

JAMES R. HEMPHILL. 

